A versatile experimental method for the electrical control of quantitatively defined biaxial strain in thin films will be introduced. It relies on growing the films epitaxially onto piezoelectric substrates of pseudocubic 0.72Pb(Mg_1/3Nb_2/3)O­₃­ – 0.28PbTiO₃(001) (PMN-PT). Uniform reversible piezoelectric in-plane strain of ≤ 0.4 % can be applied. In this way, the strain-dependent magnetization and electrical conductivity of strongly correlated magnetic oxide films have been explored. Giant responses to reversible strain of the magnetization and conductivity of  various manganites R_1-xA_xMnO₃ (R = La, Pr; A = Sr, Ca) will be discussed. An even larger effect on electron transport has been discovered in strained La_1-xSr_xCoO₃ films [1]. We employed x-ray diffraction methods to study quantitatively the elastic film strains. [1] A. D. Rata et al., Phys. Rev. Lett. 100, 076401 (2008)

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1. Strain and charge modulation in multiferroic manganite - titanate film systems